That's the 1st thing I tell anyone with a new nitro - set the needles to factory specs. They are often not set right. I've had 3 rtrs and all were set wrong (1 Tmaxx and 2 Savages).

Even used, unless it came form someone you know, start from factory settings and tune it yourself. Assuming needles are set where they're supposed to be causes a lot of headaches.